CN103634257A - Digital signal modulation device and method - Google Patents
Digital signal modulation device and method Download PDFInfo
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Abstract
The invention discloses a digital signal modulation device and a digital signal modulation method. The digital signal modulation device comprises N levels of modulation modules and an N-th modulation module; the first N-1 levels of modulation modules are used for modulating M channels of input signals into one channel of output signals, wherein the M is an integer greater than or equal to 2; each level of modulation module in the first N-1 levels of modulation modules comprises at least one modulation unit which is used for modulating at least two channels of input signals into one channel of output signals; the output signals of each level of modulation module in the first N-1 levels of modulation modules are adopted as input signal of a next level of modulation module; and the N-th modulation module is used for modulating signals outputted by an N-1-th level of modulation module into signals of a specified frequency band and outputting the signals, wherein the N is an integer greater than or equal to 2. With the digital signal modulation device and the digital signal modulation method of the invention adopted, classification and combined modulation of digital signals can be realized; the number of front-end equipment can be effectively reduced; modulation efficiency and equipment density can be improved; and system power consumption can be reduced.
Description
Technical field
The present invention relates to modulation field, particularly, relate to a kind of digital signal modulated equipment and method.
Background technology
Along with the high speed fusion development of digital broadcast television industry and Internet industry, all multi-services are numerous and complicated staggered, emerge in an endless stream, and this combination property to Broadcast and TV system headend equipment is had higher requirement.Because the digital TV front-end QAM modulating equipment of existing One-to-All Broadcast formula digital TV network is mostly the modulating equipment of single-frequency point, and the modulating device of common this single-frequency point is to be all made with special-purpose ASIC.The bandwidth of the typical cable TV network of China is 860MHz, and each digital frequency bandwidth is 8MHz.If want the signal covering that realizes full frequency band just to need more than 90 single-frequency point QAM modulating equipment.More than 90 headend equipment, can cause the management of headend equipment very complicatedly, and power consumption is also very large, and modulation efficiency and quality all can decline.
Summary of the invention
The object of this invention is to provide a kind of digital signal modulated equipment and method, to solve above-mentioned the problems of the prior art.
To achieve these goals, the invention provides a kind of digital signal modulated equipment, this equipment comprises: N level modulation module, wherein, front N-1 level modulation module is for being modulated to a road output signal by M road input signal, every one-level modulation module in this front N-1 level modulation module comprises at least one modulating unit, and this modulating unit is used at least two-way input signal and is modulated into a road output signal; The output signal of the every one-level modulation module in described front N-1 level modulation module is as the input signal of next stage modulation module; And N level modulation module is for being modulated to the signal of N-1 level modulation module output the frequency range output of appointment; Wherein N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
The present invention also provides a kind of digital signal modulating mehtod, the method comprises: M road input signal is carried out to the modulation of N level, after the premenstrual N-1 level modulation of described M road input signal, become a road output signal, this output signal is modulated onto frequency range the output of appointment through the modulation of N level, wherein, every one-level modulation in described front N-1 level modulation is carried out two-way input signal at least, and before the every one-level modulation in carrying out described front N-1 level modulation, the input signal that this grade of modulation will be modulated is divided at least one group; Every group of input signal carried out respectively to this grade of modulation, and the output signal through this grade modulation after identical with described number of packet; And the input signal of the modulation using the described signal after this grade of modulation of output as next stage; Wherein, N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
Pass through technique scheme, can realize the classification of digital signal and hybrid modulation, effectively reduce the quantity of headend equipment, improve modulation efficiency and density of equipment, reduce system power dissipation, can in a fpga chip, realize the direct modulation to more digital signal.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the structure chart of digital signal modulated equipment according to the embodiment of the present invention;
Fig. 2 is the cut-away view of exemplary modulation unit according to the embodiment of the present invention;
Fig. 3 is according to the structure chart of the digital signal modulated equipment of the preferred embodiment of the present invention;
Fig. 4 is according to the cut-away view of the modulating unit of the preferred embodiment of the present invention;
Fig. 5 is the designs simplification diagram of level Four modulation module according to the embodiment of the present invention; And
Fig. 6 is the flow chart of digital signal modulating mehtod according to the embodiment of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 1 is the structure chart of digital signal modulated equipment according to the embodiment of the present invention.As described in Figure 1, this equipment can comprise: N level modulation module, wherein, front N-1 level modulation module (as first order modulation module 10, second level modulation module 20 ..., N-1 level modulation module 30) for M road input signal is modulated to a road output signal, every one-level modulation module in this front N-1 level modulation module comprises at least one modulating unit (can comprise modulating unit 101,102,103,104 etc. as first order modulation module 10), and this modulating unit is used at least two-way input signal and is modulated into a road output signal; The output signal of the every one-level modulation module in described front N-1 level modulation module is as the input signal of next stage modulation module; And N level modulation module 40 is for being modulated to the signal of N-1 level modulation module 30 outputs frequency range the output of appointment; Wherein N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
Fig. 2 is the cut-away view of exemplary modulation unit 101 according to the embodiment of the present invention.For easier and clear, the modulating unit 101 of herein only usining is described the internal structure of modulating unit as example, is understandable that, other modulating units all can have and the same or analogous structure of modulating unit 101.
As shown in Figure 2, modulating unit 101 comprises: at least two modulation element 101-1,101-2, the quantity of the input signal of the quantity of this modulation element and described modulating unit 101 equates, wherein described in each, modulation element is (, modulation element 101-1,101-2) for described modulating unit 101 mono-road input signal is modulated, and export the signal after a road modulation; And assembled unit 101-0, for the signal combination Cheng Yi road signal after at least two-way modulation of described at least two modulation element 101-1,101-2 output is also exported, the signal after this combination is as the output signal of this modulating unit 101.
Due to the output signal of the every one-level modulation module input signal as next stage modulation module, and every one-level modulation module is all modulated two-way input signal at least, therefore, can draw, in described N level modulation module, the quantity of the modulating unit in described next stage modulation module is fewer than the quantity of the modulating unit in upper level modulation module.
Preferably, described N=4, M=96, described N level modulation module is level Four modulation module, this level Four modulation module carries out hierarchical composition modulation to 96 railway digital signals.Fig. 3 shows according to the structure chart of the digital signal modulated equipment of preferred implementation.Below in conjunction with Fig. 3, the preferred embodiment of the present invention is described in detail.
As shown in Figure 3, digital signal modulated equipment comprises level Four modulation module, is respectively first order modulation module 10, second level modulation module 20, third level modulation module 30 and fourth stage modulation module 40.Respectively the process of this level Four modulation module and level Four modulation is described below.
First, first order modulation module 10 comprise 16 modulating units (as modulating unit 101 ..., 116), 96 road input signals (as signal A1, A2 ..., A96) be divided into 16 groups in equal size, each in described 16 modulating units is for one group of input signal is carried out to one-level modulation, and export signal after 16 tunnel one-levels modulation (as signal B1 ..., B16).
Particularly, take modulating unit 101 is below described as example.Fig. 4 is according to the cut-away view of the modulating unit 101 of the preferred embodiment of the present invention.As shown in Figure 4, input signal A1 ... A6 is divided into two-way subsignal separately, as the two-way subsignal A1_I of A1 and A1_Q signal.Modulation element 101-1 in modulating unit 101 ..., 101-6 is to signal A1 ... A6 modulates, namely to subsignal A1_I, A1_Q ..., A6_I, A6_Q modulate.Each modulation element all can comprise 2 sample circuit 101-10 and 1 numerically-controlled oscillator (NCO) (as: NCO 101-11 ..., NCO 101-16), modulating unit 101 comprises 12 sample circuits and 6 NCO altogether like this, wherein, these 12 sample circuits can be identical, and all carry out 4 samplings, make clock frequency rise to 64MHz from 16MHz originally.NCO 101-11 ..., 101-16 is used for providing sinusoidal signal and cosine signal, the signal that subsignal A1_I and A1_Q by NCO 101-11 is quadrature, similarly, by NCO 101-12 ..., the subsignal A2_I of 101-16 and A2_Q ..., subsignal A6_I and A6_Q be also the signal of quadrature.
When design, the modulation frequency of modulating unit 101 can be fixed, be NCO 101-11 ..., the frequency that provides of 101-16 can be fixed, specifically can be fixed to respectively 20MHz, 12MHz, 4MHz ,-4MHz ,-12MHz ,-20MHz, that is to say, NCO 101-11 can provide sin (20MHz) and cos (20MHz) signal, and NCO 101-12 can provide sin (12MHz) and cos (12MHz) signal, by that analogy.Each frequency bandwidth is 8MHz.
Although take modulating unit 101 above as example is described, be understandable that, all the other modulating units in first order modulation module 10 (as modulating unit 102 ..., 116) all there is the structure identical with modulating unit 101.
Through modulation element 101-1 ..., 6 road signals after 101-6 modulation are fed through assembled unit 101-0 and combine, and become the signal B1 of a road after one-level modulation, this signal B1 is as the output signal of whole modulating unit 101.All the other modulating units in first order modulation module 10 (as modulating unit 102 ..., 116) output signal B2 ..., B16.
Thus, just complete the one-level modulation of Liao Dui 96 road input signals.
Secondary modulation process is described below.Second level modulation module 20 comprise 4 modulating units (as modulating unit 201 ..., 204), signal after described 16 tunnel one-levels modulation (as signal B1, B2 ..., B16) be divided into 4 groups in equal size, each in described 4 modulating units is carried out secondary modulation for the signal to after the modulation of one group of one-level, and export signal after 4 road secondary modulations (as signal C1 ..., C4).
Particularly, although be not illustrated in the drawings, be understandable that, the modulating unit 201 in second level modulation module 20 has the structure similar to modulating unit 101.It comprises 4 modulation elements, and each modulation element comprises 2 sample circuits and 1 NCO, and modulating unit 201 comprises 8 sample circuits and 4 NCO thus.Described 8 sample circuits also carry out 4 samplings, and now, the sampling clock of second level modulation module 20 is 256MHz, and the frequency of 4 NCO in modulating unit 201 is also fixed.Difference is, the frequency that these 4 NCO provide is 72MHz, 24MHz ,-24MHz ,-72MHz, and each frequency bandwidth is 48MHz.
All the other modulating units in second level modulation module 20 (as modulating unit 202 ..., 204) all there is the structure identical with modulating unit 201.
The assembled unit that 4 road signals after 4 modulation element modulation in modulating unit 201 are fed through in this modulating unit 201 combines, and becomes the signal C1 of a road after secondary modulation, and this signal C1 is as the output signal of whole modulating unit 201.All the other modulating units in second level modulation module 20 (as modulating unit 202 ..., 204) output signal C2 ..., C4.
Thus, just complete the secondary modulation of the signal of Liao Dui 16 tunnels after one-level modulation.
Three grades of modulated processs are described below.Third level modulation module 30 comprises 1 modulating unit (as modulating unit 301), described 1 modulating unit for to the signal after described 4 road secondary modulations (as signal C1, C2 ..., C4) carry out three grades of modulation, and export the signal (as signal D1) after the modulation of three grades, 1 tunnel.
Particularly, although be not illustrated in the drawings, be understandable that, the modulating unit 301 in third level modulation module 30 has the structure similar to modulating unit 101.It comprises 4 modulation elements, and each modulation element comprises 2 sample circuits and 1 NCO, and modulating unit 301 comprises 8 sample circuits and 4 NCO thus.Described 8 sample circuits carry out 8 samplings, and now, the sampling clock of third level modulation module 30 is 2048MHz.But the work clock of system only has 256MHz, want to allow the work of system speed to 2048MHz, need to adopt heterogeneous NCO technology.For example, if export the sine wave of a 2048MHz, can make the clock of 256MHz export 8 phase points, this is just equivalent to 2048MHz and has exported a point simultaneously.Therefore, the NCO in this modulating unit 301 is heterogeneous NCO, and the frequency that is exactly 256MHz has been exported 8 phase points simultaneously, has so just realized the data rate of 2048MHz.The frequency of third level modulation module can be 1024MHz with interior any frequency, but for the ease of calculating, also can be fixed, that is to say, the frequency that 4 NCO provide is 288MHz, 96MHz ,-96MHz ,-288MHz.Now, third level modulation module 30 actual modulated 24 frequencies.
The assembled unit that 4 road signals after 4 modulation element modulation in modulating unit 301 are fed through in this modulating unit 301 combines, become the signal D1 of a road after three grades of modulation, this signal D1 is as whole modulating unit 301, the output signal of third level modulation module 30 namely.
Thus, three grades of modulation of the signal after secondary modulation to 4 tunnels have just been completed.
Fourth stage modulated process is described below.Fourth stage modulation module 40 is for being modulated to the signal D1 after the three grades of modulation in described 1 tunnel the frequency range output of appointment.The structure of this fourth stage modulation module 40 is similar with modulating unit 101, and it comprises 2 sample circuits and a NCO, and wherein these 2 sample circuits carry out 2 samplings, and now, the sampling clock of fourth stage modulation module 40 is 4096MHz.Same as above, the NCO in this fourth stage modulation module 40 also should be heterogeneous NCO, by the frequency of 256MHz, exports 16 phase points simultaneously, with this, realizes the data rate of 4096MHz.The modulation frequency of this fourth stage modulation module 40 can be arranged by user oneself, with this, realizes frequency range the output that the signal D1 after the three grades of modulation in described 1 tunnel is modulated to appointment.The fourth stage is modulated to afterbody modulation, can export 96 frequencies from fourth stage modulation module 40, and can be accessed by from the signal of fourth stage modulation module 40 outputs the digital to analog converter (DAC) that sample rate is 4096MHz.
Thus, just complete the level Four modulated process of Liao Dui 96 road input signals.
The above-mentioned sample circuit that carries out 4 samplings, 8 samplings, all can every 2 times samples, and as 4 samplings, can first carry out 2 samplings, carry out 2 samplings again, and the method for 8 samplings is also similar.
Below in conjunction with Fig. 5 introduction, how to modulate the signal to the principle of the frequency range of appointment.For easy, Fig. 5 shows the brief configuration of level Four modulation module, and the modulated process of Cong Dui mono-road signal is illustrated.
As shown in Figure 5, can draw following expression:
I
2＝I
1Cosω
1+Q
1Sinω
1
Equation (1)
Q
2＝I
1Sinω
1-Q
1Cosω
1
Wherein, I
1, Q
1represent two-way input subsignal, I
2, Q
2the two-way subsignal of expression after one-level modulation, ω
1for fixed frequency.
By that analogy, can draw I
3, Q
3, I
4, Q
4and the expression formula of the output of last RF:
I
3＝I
2Cosω
2+Q
2Sinω
2
Equation (2)
Q
3＝I
2Sinω
2-Q
2Cosω
2
I
4＝I
3Cosω
3+Q
3Sinω
3
Equation (3)
Q
4＝I
3Sinω
3-Q
3Cosω
3
RF=I
4sin ω
4-Q
4cos ω
4equation (4)
Wherein, I
3, Q
3the two-way subsignal of expression after secondary modulation, I
4, Q
4the two-way subsignal of expression after three grades of modulation, RF represents the signal after level Four modulation, i.e. final output signal; ω
2, ω
3for fixed frequency, ω
4for user arranges frequency.
Through arranging, can show that the expression formula of the output frequency f of output signal RF is:
F=ω
4-ω
3+ ω
2-ω
1equation (5)
As mentioned above, ω
1, ω
2and ω
3for fixed frequency, ω
4for user arranges frequency, like this, can final output signal be modulated to designated frequency band according to arranging of user.
Fig. 6 shows the flow chart of digital signal modulating mehtod according to the embodiment of the present invention.As shown in Figure 6, the method comprises: M road input signal is carried out to the modulation of N level, after the premenstrual N-1 level modulation of described M road input signal, become a road output signal, this output signal is modulated onto the frequency range of appointment and exports 608 through the modulation of N level, wherein, every one-level modulation in described front N-1 level modulation is carried out two-way input signal at least, and before the every one-level modulation in carrying out described front N-1 level modulation, the input signal that this grade of modulation will be modulated is divided at least one group 602; Every group of input signal carried out respectively to this grade of modulation 603, and the output signal through this grade modulation after 604 identical with described number of packet; And the input signal 606 of the modulation using the described signal after this grade of modulation of output as next stage; Wherein, N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
In addition, one group of input signal in described at least one group being carried out to arbitrary grade of modulation comprises: this group input signal Zhong Mei road input signal is carried out respectively exporting after this grade of modulation; And the signal combination after this grade of modulation becomes a road signal output by this group, the signal after this combination is as the output signal after this grade of modulation of this group.
The modulation frequency of the every one-level modulation in described front N-1 level modulation is fixed, and the modulation frequency in described N level modulation is that user sets.
Preferably, described N=4, M=96.In this case, M road input signal is carried out to N level to be modulated to Dui96 road input signal and to carry out level Four modulation, be specially: described 96 road input signals are divided into 16 groups, described 16 groups of input signals are carried out respectively to first order modulation, and export the signal after 16 tunnel first order modulation; Signal averaging after described 16 tunnel first order modulation is divided into 4 groups, the signal after described 4 groups of first order modulation is carried out to second level modulation, and export the signal after 4 second level, tunnel modulation; Signal after described 4 second level, tunnel modulation is carried out to third level modulation, and export the signal after 1 tunnel third level modulation; And the signal after described 1 tunnel third level modulation is carried out to fourth stage modulation, the signal after described 1 tunnel third level modulation is modulated onto frequency range the output of appointment through described fourth stage modulation.
The process of every one-level modulation and the setting of relevant parameter, all with noted earlier consistent, just repeat no more herein.
Thus, above-described digital signal modulated equipment and method, by to the classification of digital signal and hybrid modulation, effectively reduced the quantity of headend equipment, improve modulation efficiency and density of equipment, reduce system power dissipation, can in a fpga chip, realize the direct modulation to more digital signal.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, between various execution mode of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a digital signal modulated equipment, this equipment comprises: N level modulation module, wherein,
Front N-1 level modulation module is for being modulated to a road output signal by M road input signal, and the every one-level modulation module in this front N-1 level modulation module comprises at least one modulating unit, and this modulating unit is used at least two-way input signal and is modulated into a road output signal; The output signal of the every one-level modulation module in described front N-1 level modulation module is as the input signal of next stage modulation module; And
N level modulation module is for being modulated to the signal of N-1 level modulation module output the frequency range output of appointment;
Wherein N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
2. digital signal modulated equipment according to claim 1, wherein, described modulating unit comprises:
At least two modulation elements, the quantity of the quantity of this modulation element and the input signal of described modulating unit is equal, and wherein described in each, modulation element is used for described modulating unit one road input signal to modulate, and exports the signal after a road modulation; And
Assembled unit, for the signal combination Cheng Yi road signal after at least two-way modulation of described at least two modulation elements output is also exported, the signal after this combination is as the output signal of this modulating unit.
3. digital signal modulated equipment according to claim 1 and 2, wherein, the modulation frequency of the every one-level modulation module in described front N-1 level modulation module is fixed, and the modulation frequency in described N level modulation module is that user sets.
4. digital signal modulated equipment according to claim 3, wherein, described N=4, M=96.
5. digital signal modulated equipment according to claim 4, described N level modulation module is level Four modulation module, wherein:
First order modulation module comprises that 16 modulating unit ，96 road input signals are divided into 16 groups in equal size, and each in described 16 modulating units is for one group of input signal is carried out to one-level modulation, and exports the signal after 16 tunnel one-levels modulation;
Second level modulation module comprises 4 modulating units, and the signal after described 16 tunnel one-level modulation is divided into 4 groups in equal size, and each in described 4 modulating units is carried out secondary modulation for the signal to after one group of one-level modulation, and exports the signal after 4 road secondary modulations;
Third level modulation module comprises 1 modulating unit, and described 1 modulating unit is used for the signal after described 4 road secondary modulations to carry out three grades of modulation, and exports the signal after the modulation of three grades, 1 tunnel; And
Fourth stage modulation module is for being modulated to the signal after the three grades of modulation in described 1 tunnel the frequency range output of appointment.
6. a digital signal modulating mehtod, the method comprises: M road input signal is carried out to the modulation of N level, after the premenstrual N-1 level modulation of described M road input signal, become a road output signal, this output signal is modulated onto frequency range the output of appointment through the modulation of N level, wherein,
Every one-level modulation in described front N-1 level modulation is carried out two-way input signal at least, and before the every one-level modulation in carrying out described front N-1 level modulation, the input signal that this grade of modulation will be modulated is divided at least one group;
Every group of input signal carried out respectively to this grade of modulation, and the output signal through this grade modulation after identical with described number of packet; And
The input signal of modulation using the described signal after this grade of modulation of output as next stage;
Wherein, N is more than or equal to 2 integer, and M is more than or equal to 2 integer.
7. method according to claim 6, wherein, one group of input signal in described at least one group is carried out to arbitrary grade of modulation and comprise:
This group input signal Zhong Mei road input signal is carried out respectively exporting after this grade of modulation; And
Signal combination by this group after this grade of modulation becomes a road signal output, and the signal after this combination is as the output signal after this grade of modulation of this group.
8. according to the method described in claim 6 or 7, wherein, the modulation frequency of the every one-level modulation in described front N-1 level modulation is fixed, and the modulation frequency in described N level modulation is that user sets.
9. method according to claim 8, wherein, described N=4, M=96.
10. method according to claim 9, describedly carries out N level to M road input signal and is modulated to Dui96 road input signal and carries out level Four modulation, wherein:
Described 96 road input signals are divided into 16 groups, described 16 groups of input signals are carried out respectively to first order modulation, and export the signal after 16 tunnel first order modulation;
Signal averaging after described 16 tunnel first order modulation is divided into 4 groups, the signal after described 4 groups of first order modulation is carried out to second level modulation, and export the signal after 4 second level, tunnel modulation;
Signal after described 4 second level, tunnel modulation is carried out to third level modulation, and export the signal after 1 tunnel third level modulation; And
Signal after described 1 tunnel third level modulation is carried out to fourth stage modulation, and the signal after described 1 tunnel third level modulation is modulated onto frequency range the output of appointment through described fourth stage modulation.
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| CN1419757A (en) * | 2000-02-23 | 2003-05-21 | 埃德文特网络股份有限公司 | System and method for distributing information via a communication network |
| US20090021320A1 (en) * | 2006-01-23 | 2009-01-22 | Nxp B.V. | Cartesian modulation system via multi-level pulse width modulation |
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Application publication date: 20140312 |